/**
 * Copyright (c) 2013-2020 Contributors to the Eclipse Foundation
 *
 * <p> See the NOTICE file distributed with this work for additional information regarding copyright
 * ownership. All rights reserved. This program and the accompanying materials are made available
 * under the terms of the Apache License, Version 2.0 which accompanies this distribution and is
 * available at http://www.apache.org/licenses/LICENSE-2.0.txt
 */
package org.locationtech.geowave.analytic.mapreduce.kde.compare;

import java.io.IOException;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.Mapper;

public class ComparisonCombiningStatsMapper extends
    Mapper<LongWritable, DoubleWritable, LongWritable, DoubleWritable> {

  @Override
  protected void map(
      final LongWritable key,
      final DoubleWritable value,
      final org.apache.hadoop.mapreduce.Mapper.Context context)
      throws IOException, InterruptedException {
    long positiveKey = key.get();
    double adjustedValue = value.get();
    if (positiveKey < 0) {
      positiveKey = -positiveKey - 1;
      adjustedValue *= -1;
    }
    super.map(new LongWritable(positiveKey), new DoubleWritable(adjustedValue), context);
  }
}
